EP0931593B1 - Dispositif pour le traitement des déchets solides - Google Patents

Dispositif pour le traitement des déchets solides Download PDF

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Publication number
EP0931593B1
EP0931593B1 EP19990100829 EP99100829A EP0931593B1 EP 0931593 B1 EP0931593 B1 EP 0931593B1 EP 19990100829 EP19990100829 EP 19990100829 EP 99100829 A EP99100829 A EP 99100829A EP 0931593 B1 EP0931593 B1 EP 0931593B1
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European Patent Office
Prior art keywords
magnetic
waste solid
waste
solid
water
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EP19990100829
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German (de)
English (en)
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EP0931593A2 (fr
EP0931593A3 (fr
Inventor
Norihide Saho
Hisashi Isogami
Minoru Morita
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Hitachi Ltd
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Hitachi Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/02Magnetic separation acting directly on the substance being separated
    • B03C1/025High gradient magnetic separators
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/005Pretreatment specially adapted for magnetic separation
    • B03C1/015Pretreatment specially adapted for magnetic separation by chemical treatment imparting magnetic properties to the material to be separated, e.g. roasting, reduction, oxidation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/48Treatment of water, waste water, or sewage with magnetic or electric fields
    • C02F1/488Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities

Definitions

  • the invention relates to an apparatus for treating a waste solid which exits from a purification device and which includes magnetic flocks consisting of magnetic substances and solid waste components, wherein the apparatus comprises means for heating the waste solid to a high temperature.
  • the invention relates particularly to a waste solid treatment apparatus capable of efficiently separating, dehydrating and drying waste solid including ferromagnetic seeds which are brought about from a purification apparatus by magnetic separation.
  • U.S. 4,193,866 discloses a method for the purification of aqueous polluted liquid containing suspended particulate impurities by adding to the liquid an aqueous flocculating solution comprising an aqueous solution of poly-ethyleneimine for co-flocculating the particulate suspended impurities and a magnetic powder and producing a dense flocculated mixture, which settles rapidly in a matter of minutes.
  • Settling can be substantially speeded up by application of magnetic field to the resulting flocculated mixture and magnetically settling the mixture for example by use of magnetic filters.
  • the resulting sludge is strained and the ferrite powder can be generated by bioregeneration or incineration.
  • U.S. 3,803,033 discloses a process of the generic kind for the removal of organic contaminants from a fluid stream containing organic contaminants.
  • the process involves dispersing a magnetically susceptible iron-carbon complex in the fluid stream, maintaining the magnetically susceptible iron-carbon complex in a disposed condition until a substantial amount of contaminants have been adsorbed from the fluid stream, and passing the magnetically susceptible iron-carbon complex containing dispersion through a magnetic filter to separate the dispersion into a fluid stream having a reduced concentration of contaminants and adsorbed complex containing contaminants.
  • Regeneration of the adsorbed complex may be accomplished by heating the complex in an inert atmosphere at a temperature sufficient to desorb and vaporize the contaminants.
  • contaminants and activated complex can be removed, which are able to vaporize.
  • U.S. 5,360,553 describes a thermal depolymerization processor for converting a process material into other useful products comprising means for mixing a process material with a process liquid and forming a emulsion of slurry. Means is provided for pressuring and heating the slurry, and the slurry is then fed to means for quickly reducing the pressure to a relatively low value and further increasing the temperature. The rapid drop in pressure and increase in temperature causes components of the slurry to convert to volatile gases and separate from the remainder of the slurry which is removed from the processor in the form of solids. The gas is fed to one or more condensers which separate the gas into useful liquids such as various grades of oil.
  • JP-A-59-371 There has been known an apparatus described in JP-A-59-371 as an apparatus of continuously purifying water to be treated from sea, lake, river or a reservoir by applying solid/liquid separation art by magnetic separation. This is a purification apparatus by a magnetic separation device using a high gradient magnetic filter.
  • the raw water is agitated by adding thereto, for example, ferromagnetic seeds of triiron tetroxide, polyaluminum sulfate or polyaluminum chloride as a flocculant to thereby bring about a number of magnetic coagulants (magnetic flocks) having a magnetism, that is, magnetic substance in a colloidal form from suspended solids, phytoplanktons, fungi and microorganisms in the raw water by the flocculant.
  • magnetic coagulants magnetic flocks having a magnetism, that is, magnetic substance in a colloidal form from suspended solids, phytoplanktons, fungi and microorganisms in the raw water by the flocculant.
  • Fig. 4 shows a basic flow of a purification apparatus by magnetic separation.
  • Raw water in a reservoir 1 is temporarily stored from a conducting tube 2 to a raw water storing tank 5 by a pump 4 via a filter 3 for taking large waste.
  • Ferromagnetic seeds of triiron tetroxide and a flocculant of polyaluminum chloride, polyferric sulphate and high molecular polymer are added from a chemical adjusting device 7 to raw water 6 in the raw water storing tank 5 via a conducting pipe 8, the raw water is agitated by an agitator 11 rotated by a motor 10 in an agitating tank 9 and pretreated water 12 including magnetic substances of magnetic flocks is produced.
  • the pretreated water 12 is made to flow into a magnetic separation vessel 15 via a valve 13 and a conducting tube 14.
  • Direct current power source is flowed from a direct current power source 17 to an air-core coil 16.
  • a magnetic field in proportion to the direct current is generated in the magnetic separation vessel 15 having a cylindrical shape and the magnetic field is made uniform by a porous magnetic pole 18 for conducting water. Further, the magnetic field is surrounded by a yoke 19 and the yoke 19 prevents leakage as a passage of magnetic force lines.
  • a magnetic filters matrix in a matrix shape at a high gradient magnetic filter 20 is magnetized by the magnetic field which is made uniform.
  • a disturbance is caused in the magnetic field at inside of the magnetic separation vessel 15 by the article charged with the magnetized magnetic filters, coarse and dense portions are produced locally in magnetic fluxes and a number of portions constituting high magnetic gradient are produced.
  • the magnetic flocks in the raw water are caught by surfaces of the magnetic filters constituting the charged article and the purified raw water passes through a valve 21 and a conducting tube 22 as treated water, temporarily stored in a treated water tank 23 and returned to the reservoir 1 via a conducting tube 24.
  • air is supplied from an air tank 26 to the magnetic separation unit via a valve 27 and a conducting pipe 28 and the magnetic flocks adhered to the surfaces of the magnetic filters are washed to remove while carrying out air bubbling and wash water is stored in a backwash-treated water tank 29.
  • the wash water is conducted from the backwash-treated water tank 29 to a mechanical agitator where the magnetic flocks are crushed, the ferromagnetic seeds are separated from the flocks and the ferromagnetic seeds are recovered through ferromagnetic seeds recovering machine, that is, an electromagnetic separator. Thereafter, the moisture is removed as less as possible by a centrifugal separator or a sheet press pre-dryer, conveyed out after lowering the moisture content, dumped to a reclamation site or incinerated. The recovered ferromagnetic seeds are used again.
  • the wash water from the backwash-treated water tank 29 is removed of the moisture as less as possible by a centrifugal separator or a sheet press pre-dryer, conveyed out after lowering the moisture content and is incinerated in an incinerating furnace.
  • the ferromagnetic seeds are recovered from the incineration ash by an electromagnetic separator using a magnet and thereafter, the ash is dumped to a reclamation site.
  • a bubble floating separation art as a conventional purification technology.
  • raw water to be subjected to water treatment is added with a flocculant, for example, polyaluminum sulfate or polyaluminum chloride after intaking the raw water and agitated.
  • a flocculant for example, polyaluminum sulfate or polyaluminum chloride
  • the flocculant suspended solids, phytoplanktons, fungi and microorganisms in the raw water are converted into flocks to constitute coagulators in a colloidal form.
  • foamed water is injected and the coagulators are floated up by adhering very small air bubbles thereto and are separated from the raw water.
  • the floating separation apparatus is operated in the following manner.
  • Raw water in a reservoir is temporarily stored from a conducting tube into a raw water storing tank by a pump via a filter for taking large waste.
  • the raw water is added with a flocculant of polyaluminum chloride or polyferric sulphate from a chemical adjusting device via a conducting pipe and is agitated by an agitator rotated by a motor in an agitating tank and an agitating action caused by a disturbance of flow produced by flowing in the raw water is utilized whereby pretreated water including flocks is produced.
  • the pretreated water flows into a floatation separation vessel via a valve and via a conducting pipe. High pressure water dissolved with air from a pressurized water producing device is injected from a lower portion of the floatation separation vessel.
  • the pressure of the high pressure water is reduced in the pressurized water producing device which is opened to the atmosphere and the dissolved air becomes very small air bubbles and floated up in the floatation separation vessel. At this occasion, the air bubbles adhere to the flocks and float up the flocks to water surface at a free interface.
  • the floated flocks are recovered by a scraping recovering machine and is removed to separate from the raw water.
  • the recovered blocks are removed of the moisture as less as possible by a centrifugal separating machine or a sheet press pre-dryer, conveyed out after lowering the moisture content and dumped to a reclamation site or incinerated.
  • JP-A-6-511190 is a method of subjecting sewage waste solid or bottom mud of river, lake or ocean to oxidation treatment by high temperature and high pressure water.
  • This is an oxidation process under super critical water.
  • Object waste solid is waste solid including inorganic substance, organic substance and heavy metals which is subjected to oxidation treatment under super critical water of 350 °C or higher and 210 bar pressure or higher by mixing together an oxidation agent in a procedure of elevating temperature and elevating pressure of waste solid.
  • inorganic solid substances after treatment are separated from a liquid by a difference between specific gravities of the solid substances and the treating liquid.
  • phosphor present in animal or plant planktons in waste solid of river, lake or ocean or phosphor in waste solid can be recovered, it can be reused effectively in a fertilizer.
  • phosphor is mixed in the incinerated ash along with other inorganic substances and is difficult to separate from ash. Further, phosphor is present in a treating liquid as a phosphate in the oxidation treatment apparatus under super critical water.
  • the ferromagnetic seeds for example, magnetite is oxidated at high temperatures and changed into hematite, the magnetic susceptibility is deteriorated or pieces of the coagulants are adhered to the recycled ferromagnetic seeds.
  • the ferromagnetic seeds are recovered from mechanically agitated waste solid by an electromagnetic separator using a magnet, fine pieces of the ferromagnetic seeds are mixed in the waste solid, these are difficult to recover by the electromagnetic separator and accordingly, the recovery rate is lowered.
  • a location of dumping or incinerating waste solid at a reclamation site is frequently remote from a location of causing or forming waste solid and in order to transport the waste solid, the moisture content of the waste solid must be reduced and water must be prevented from leaking from a transportation vehicle and the waste solid is transported after being dehydrated by a centrifugal separator or a sheet press pre-dryer.
  • the waste solid treatment apparatus comprising means for producing high temperature and high pressure waste solid in a subcritical state, magnetic separation means for separating the magnetic substances from the waste solid of high temperature and high pressure obtaining a waste solid free of magnetic substances but including solid waste components, and means for separating the solid waste components from the waste solid free of magnetic substances by pressure reducing means and additional heating means.
  • the magnetism to the substances to be removed in the fluid to be treated by adding an additive for producing ferromagnetic seeds by a chemical reaction between the ferromagnetic seeds and a flocculant or the substances to be removed to the fluid to be treated.
  • the magnetic separating means for removing to separate the ferromagnetic seeds or magnetic substances from the waste solid at a high temperature and a high pressure may be constituted by a magnetic separator in a plurality of stages having different magnetic forces such that the magnetic substances having different magnetic susceptibilities can be separated to classify by differences in the magnetic susceptibilities by utilizing the differences in the magnetic susceptibilities.
  • the waste solid treatment apparatus for treating waste solid in which articles to be removed are condensed by adding a flocculant of an inorganic or organic-base to raw water including substances to be removed and separating to remove the substances to be removed
  • the waste solid treatment apparatus comprising means for subjecting the waste solid to a decomposition treatment by high temperature and high pressure treating means and magnetizing metal compounds in the waste solid after having been subjected to the decomposition treatment by a chemical reaction, separation treatment means for selectively separating and removing the magnetized metal compounds in the waste solid, and means for drying the waste solid free of magnetic substances at a high temperature and a high pressure by heating it under a reduced pressure.
  • the temperature may be controlled to be a temperature from substantially about 200 °C to less than 350 °C and the pressure may be maintained to be about 2 MPa or 2 MPa or less by the high temperature and high pressure water producing means.
  • a flocculant of an inorganic or organic-base is used.
  • the coagulating action of the flocculant is broken in the high temperature and high pressure water, solid matters in flocks are disintegrated, the flocculant is stripped off the surrounding of ferromagnetic seeds in the waste solid and single bodies of the ferromagnetic seeds are separated.
  • waste solid is agitated, the function of separating the ferromagnetic seeds is further promoted.
  • the temperature at this occasion is controlled to a temperature less than 350 °C to prevent the ferromagnetic seeds from being oxidized and preferably, the pressure is maintained at about 2 MPa or slightly higher than saturation pressure equal to or lower than 2 MPa substantially around 200 °C such that water is brought into a subcritical state.
  • the separated ferromagnetic seeds are removed to separate from a subcritical solution (high temperature and high pressure waste solid) or high temperature and high pressure waste solid near to a subcritical solution.
  • Components having weak magnetism of heavy metals in the high temperature and high pressure waste solid removed of the ferromagnetic seeds is treated to increase an absolute value of the magnetic susceptibility by a chemical reaction of oxidation or eutectic bonding.
  • a diamagnetic substance can also be magnetically separated. That is, an oxidizer of an iron compound, an alkaline agent, air or oxygen is supplied from a chemical tank and is subjected to a chemical reaction with the weak magnetism components of heavy metals. Solid matters formed by the reaction including the heavy metals produced by the chemical reaction can be separated to remove from the waste solid solution by magnetic separation or specific gravity separating means.
  • the moisture is evaporated by, for example, spraying into the atmospheric pressure under reduced pressure and heating treatment and other molecular substances become solid matters having very small moisture content and are collected by specific gravity separation, centrifugal separation or filtering separation. Accordingly, the volume of the waste solid is reduced to the volume of the solid matters and organic substance components can be subjected to compost treatment.
  • the ferromagnetic seeds having no impurities can be reused by recovering it by substantially 100 % and a reduction in the cost of using the ferromagnetic seeds can be achieved. Further, by combining with a purification apparatus of fluid to be treated by magnetic separation, the operation cost of the magnetic separation device can significantly be reduced and the waste solid disposal cost can significantly be reduced by reduced volume formation of the waste solid.
  • waste solid can be removed by eutectic formation and accordingly, there is achieved an effect in which contamination is not resulted from the dumped waste solid.
  • metal oxides can be separated to remove and heavy metal components can be removed from the waste solid to be dumped.
  • Raw water of a reservoir 1 is temporarily stored from a conducting tube 2 into a raw water storing tank 5 by a pump 4 via a filter 3 for taking large waste.
  • Raw water 6 is added with ferromagnetic seeds of triiron tetroxide and a flocculant of polyaluminum chloride from a chemical adjusting device 7 via a conducting pipe 8 and agitated by an agitator 11 rotated by a motor 10 in an agitating tank 9 to thereby produce pretreated water 12 including magnetic substances of magnetic flocks produced by agitation.
  • solid matters 90 of phytoplanktons in the raw water 6 are converted into magnetic flocks 93 in a colloidal form by a coagulating action of a flocculant 92 along with ferromagnetic seeds 91 to thereby constitute the treated water 12.
  • the treated water 12 flows into a magnetic separation vessel 15 via a valve 13 and via a conducting tube 14.
  • Direct current power source is flowed from a direct current power source device 17 to an air-core coil 16.
  • a magnetic field in proportion to the direct current is generated in the magnetic separation vessel 15 in a cylindrical shape and the magnetic field is made uniform by a porous magnetic pole 18 for conducting water.
  • the magnetic field is surrounded by a yoke 19 made of iron and the yoke 19 prevents leakage as a passage of magnetic force lines.
  • a magnetic filters matrix in a matrix of a high gradient magnetic filter 20 is magnetized by the magnetic field which has been made uniform.
  • a disturbance is caused in the magnetic field in the magnetic separation vessel 15 by the magnetized magnetic filters matrix, coarse and dense portions of magnetic fluxes are produced locally and a number of portions constituting high magnetic gradient are caused.
  • the pretreated water 12 including the magnetic flocks 93 When the pretreated water 12 including the magnetic flocks 93 is delivered from a lower portion in an upward flow, the magnetic flocks in the raw water are caught on surfaces of the magnetic filters of the charged article by large magnetic force, the purified raw water is temporarily stored in a treated water tank 23 via a valve 21 and a conducting tube 22 and is returned to the reservoir 1 via a conducting tube 24.
  • backwashing of the filter is carried out to recover the function of magnetic separation.
  • the valve 13 is closed and delivery of the pretreated water 12 is stopped.
  • direct current power source is cut, the magnetic field is nullified, thereafter, a predetermined amount of the treated water is flowed back from an upper portion of the high gradient magnetic filter 20 via the valve 21 and a valve 25 is opened.
  • air is supplied from an air tank 26 via a valve 27 and a conducting pipe 28, the magnetic flocks adhered to surfaces of the magnetic filters are washed to remove while carrying out air bubbling, wash water is stored in a backwater treatment device 29a and is subjected to a dehydration treatment by a centrifugal separator. The treated water is returned to the reservoir 1 from a pipe 29b. A concentration of including the magnetic flocks is increased in the washed and dehydrated waste solid which has been washed to remove of the magnetic flocks as shown by Fig. 2A.
  • Waste solid is carried out from a bottom portion of the backwash-treated water tank 29a and is introduced into a slurry pressurizing pump 31 via a pipe 30.
  • a slurry pressurizing pump 31 At an inlet portion of the slurry pressurizing pump 31, an alkaline solution of water, a reaction accelerating agent and a neutralizer necessary for treating by high temperature and high pressure water is added from a chemical tank 32 to the waste solid via a valve 33.
  • the waste solid the pressure of which is increased to about 2 MPa by the slurry pressurizing pump 31 is delivered into a reaction tube 34 and water heated to about 20 °C by a heater 35 heated by a power source 36 and an extra heat exchanger 37 utilizing recovery heat after waste solid treatment, is brought into a subcritical state.
  • Plant or animal plankton in waste solid is an organic substance and the flocculant is of an inorganic and organic-base. Therefore, as shown by Fig. 2B, bonding of coagulated flocks and magnetic flocks is destructed in subcritical water, solid matters in the flocks are disintegrated and the organic substances become a subcritical solution 94 mixed with oily and highly viscous liquid and moisture. The flocculant is stripped off the surrounding of the ferromagnetic seeds 91 in waste solid and single bodies of the ferromagnetic seeds are separated. Therefore, in ferromagnetic seeds separator shown by Fig. 1, separation of the ferromagnetic seeds is accelerated by agitating means (not illustrated) and as shown by Fig.
  • the ferromagnetic seeds are guided in a direction of an end portion of a separator 38 and are collected at an end portion of a vessel by using magnetism generating means 39, for example, electromagnets 39a, 39b and 39c and switching power sources of the respective electromagnets.
  • magnetism generating means 39 for example, electromagnets 39a, 39b and 39c and switching power sources of the respective electromagnets.
  • the waste solid in the reaction tube 34 is added with oxygen, hydrogen peroxide, air, an eutectic reaction agent, an acidic or an alkaline solution necessary for subjecting the waste solid free of the ferromagnetic seeds to an oxidation treatment in high temperature and high pressure water from a chemical tank 41 via a valve 42 and a pump 43.
  • oxygen, hydrogen peroxide, air, an eutectic reaction agent, an acidic or an alkaline solution necessary for subjecting the waste solid free of the ferromagnetic seeds to an oxidation treatment in high temperature and high pressure water from a chemical tank 41 via a valve 42 and a pump 43.
  • the iron compounds 95 and the heavy metal oxide molecules 96 are guided in a direction of an end portion of a magnetic article separator 46 by switching power sources of electromagnets 45a, 45b and 45c and are collected at an end portion of a vessel.
  • a high gradient magnetic filter may be arranged in the magnetic article separator 46 by which collecting capacity is enhanced.
  • a waste solid solution at a high temperature and a high pressure is subjected to pressure reduction and sprayed from a nozzle 50 into a flush tank 49.
  • the inside of the flush tank 49 is adjusted to pressure slightly higher than the atmospheric pressure by a pressure adjusting valve 51 in the flush tank 49.
  • a portion of the moisture of the waste solid solution at the high temperature and the high pressure is spontaneously evaporated by an inner heat capacity and a remaining portion is evaporated by being heated by a heater 52 heated by a power source 53.
  • the vapor preserves temperature of a wall of the flush tank 49 by a heat exchanger 54 and the vapor is prevented from condensing in the flush tank 49.
  • the vapor passes through a pipe 57 subjected to heat recovery at the extra heat exchanger 37, becomes condensed water at a condensing cooler 58 and is returned to the reservoir 1.
  • chemicals are injected into the condensed water to thereby carry out neutralization treatment in order to make pH of the condensed water further neutral.
  • an amount of heating of the heater 52 can also be reduced by adjusting pressure in the condensing cooler 58 at lower than the atmospheric pressure and bringing pressure in the flush tank 49 under the atmospheric pressure to thereby increase a spontaneous evaporation amount.
  • coagulating action of the flocculant is broken in the high temperature and high pressure water, solid articles in the flocks are disintegrated, the flocculant is stripped off the surrounding of the ferromagnetic seeds in the waste solid and single bodies of the ferromagnetic seeds can be separated and accordingly, the ferromagnetic seeds having a high purity can be recovered when it is reused.
  • the volume of waste solid can be reduced and the cost of waste solid treatment can also be reduced.
  • waste solid having the reduced volume can be reused as a fertilizer of an organic fertilizer or an inorganic fertilizer.
  • waste solid treating apparatus which is removed of the apparatus of recovering the ferromagnetic seeds of the backwash water treating device 29a and devices thereafter, is applied to waste solid which is brought about by other purification apparatus such as a floatation separation apparatus using a flocculant of polyaluminum chloride or polyferric sulphate, an effect other than the effect of recovering and reusing the ferromagnetic seeds is similarly achieved.
  • other purification apparatus such as a floatation separation apparatus using a flocculant of polyaluminum chloride or polyferric sulphate
  • aluminum in the flocculant can be removed from the waste solid treatment water as a metal oxide and therefore, waste solid treatment removed of aluminum can be carried out.
  • a centrifugal dehydrating device at a low rotational number or a small sized belt-pressurized dehydrating device can be used which achieves an effect capable of reducing the device cost.
  • Fig. 3 shows other embodiment of the invention.
  • Fig. 3 is a diagram showing only a unit of treating backwash waste solid and a point of the embodiment which differs from the constitution of Fig. 1 resides in that a high gradient magnetic separator 59 using a magnetic filter having large magnetic suction force is arranged as means for magnetically separating the iron compounds 95 and the heavy metal oxide molecules 96 having the small magnetic susceptibility in waste solid the temperature of which is controlled by the temperature adjuster 44 (refer to Fig. 2D).
  • Magnetic filters 61 and 62 are arranged in chambers at left and right portions of the drawing partitioned by a partition wall 60 in the high gradient magnetic separator 59, a magnet 63 in a cylindrical shape is installed at outer peripheral portions of the magnetic filters and a magnetic field is generated in a space where the magnetic filters are arranged.
  • the magnet 63 is moved alternately at the outer peripheral portions of the magnetic filters 61 and 62 and the magnetic filters 61 and 62 are present in spaces at inside of the magnetic field and at outside of the magnetic field.
  • Waste solid the temperature of which is controlled by the temperature adjuster 44 is introduced into an inner portion of the magnetic filter 61 via a valve 64 and a pipe 65.
  • High magnetic gradient is caused on the filter surface of the magnetic filter 61 by the magnetic field generated by the magnet 63, the iron compounds 95 and the heavy metal oxide molecules 96 having the small magnetic susceptibility in the waste solid are caught by the magnetic force and waste solid free of the removed iron components 95 and the heavy metal oxide molecules 96 having the small magnetic susceptibility, is introduced into the flush tank 49 via the reaction tube 34 after passing through a pipe 66 and a valve 67.
  • the iron components 95 and the metal oxide molecules 96 drawn by the magnetic filter 62 before the step are outside of the magnetic field and accordingly, treated water is conducted by a conducting pipe 68a and a pressurizing device 68b both connected to the treated water tank 23, washes the surface of the magnetic filter via a valve 69 and a conducting pipe 70 and passes through a pipe 71 and a valve 72 and treated water including the iron compounds 95 and the metal oxide molecules 96 is stored in a wash tank 73. In this case, valves 74, 75 and 76 are closed.
  • the magnet 63 is moved in the left direction of the drawing to thereby place the magnetic filter 61 at outside of the magnetic field and place the magnetic filter 62 at inside of the magnetic field.
  • Waste solid the temperature of which is controlled by the temperature adjuster 44 is introduced into an inner portion of the magnetic filter 62 after passing through the valve 75 and a pipe 77.
  • High magnetic gradient is caused on the filter surface of the magnetic filter 62 by the magnetic field generated by the magnet 63, the iron compounds 95 and the heavy metal oxide molecules 96 having the small magnetic susceptibility in waste solid are caught by the.
  • magnetic force and waste solid free of the removed iron compound 95 and the heavy metal oxide molecule 96 having the small magnetic susceptibility is introduced into the flush tank 49 via the reaction tube 34 after passing through a pipe 78 and the valve 74.
  • the iron compounds 95 and the metal oxide molecules 96 both drawn to the magnetic filter 61 before the step are present at outside of the magnetic field and accordingly, treated water is introduced into the separator 59 by a pipe 68a and a pressurizing device 68b and washes the surface of the magnetic filter after passing through the valve 76 and a conducting pipe 79 and the iron compounds 95 and the heavy metal oxide molecules 96 are stored in the wash tank 73 via a pipe 80 and a valve 81. At this occasion, valves 64, 67 and 69 are closed.
  • the heavy metals in the wash tank 73 is separately subjected to solution-treatment at high temperatures and subjected to waste treatment such that the heavy metals are not dissolved off.
  • the high gradient magnetic separator 59 is used at the heavy metal removing unit and accordingly, there is achieved an effect of capable of removing to separate particles of heavy metals having a small magnetic susceptibility.
  • an apparatus of purifying waste solid caused by animal plankton or plant plankton in respect of treated water
  • the apparatus can also be used for purifying waste solid which is brought about from sea water, river water, lake water, industrial waste water, rain water and waste water from a refuse disposal site, sewage- or wash water for exhaust gas, contaminated soil or the like including organic or inorganic substances, heavy metal substances or chemical substances.

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  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Treatment Of Sludge (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Processing Of Solid Wastes (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Claims (5)

  1. Installation pour traiter des déchets solides sortant d'un dispositif d'épuration et contenant des flocs magnétiques (93) constitués par des substances magnétiques (91) et une fraction de déchets solides, l'installation comportant des moyens (35, 37, 52) pour porter les déchets solides à une température élevée, caractérisée par
    un moyen (31) pour mettre sous une haute pression les déchets solides de façon que les déchets solides sous haute pression et à température élevée soient dans un état sous-critique,
    des moyens de séparation magnétique (38, 46, 59) pour séparer les substances magnétiques (91, 95, 96) des déchets solides sous haute pression et à température élevée en obtenant des déchets solides exempts de substances magnétiques mais contenant la fraction de déchets solides, et
    un moyen (49) pour séparer la fraction de déchets solides des déchets solides exempts de substances magnétiques à l'aide d'un moyen de réduction de pression (51) et d'un moyen de chauffage supplémentaire (52).
  2. Installation selon la revendication 1, caractérisée en ce que les moyens de séparation magnétique (38, 46, 59) comprennent des séparateurs magnétiques (38, 46, 59) disposés en étages à forces magnétiques différentes de façon que les substances magnétiques (91, 95, 96) à susceptibilités magnétiques différentes puissent être séparées par classification en fonction de leurs différences de susceptibilité magnétique.
  3. Installation selon la revendication 1 ou 2, caractérisée en ce que
    les moyens (35, 37, 52) pour chauffer lesdits déchets solides à une température élevée comportent un régulateur (44) de température pour maintenir la température sensiblement entre environ 200°C et moins de 350°C, et
    le moyen (31) pour mettre sous haute pression lesdits déchets solides comporte un régulateur de pression pour maintenir la pression à environ 2 MPa ou moins de 2 MPa et au-dessus de la pression de saturation respective des déchets solides.
  4. Installation selon l'une quelconque des revendications 1 à 3, caractérisée par des moyens (34, 41, 42, 43) pour ajouter des produits chimiques dans les déchets solides sous haute pression et à température élevée pour qu'ils réagissent avec les constituants à faible magnétisme des déchets solides afin d'accroítre leur susceptibilité dans le but d'accentuer leur séparation magnétique.
  5. Installation selon l'une quelconque des revendications 1 à 4, caractérisée par des moyens (40a, 40b, 47, 48, 72, 73, 81) pour extraire lesdites substances magnétiques (91, 95, 96) après leur séparation d'avec la fraction de déchets solides.
EP19990100829 1998-01-23 1999-01-18 Dispositif pour le traitement des déchets solides Expired - Lifetime EP0931593B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP01100598A JP3456135B2 (ja) 1998-01-23 1998-01-23 汚泥浄化乾燥装置
JP1100598 1998-01-23

Publications (3)

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EP0931593A2 EP0931593A2 (fr) 1999-07-28
EP0931593A3 EP0931593A3 (fr) 1999-12-01
EP0931593B1 true EP0931593B1 (fr) 2003-07-30

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EP (1) EP0931593B1 (fr)
JP (1) JP3456135B2 (fr)
DE (1) DE69909854T2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
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US8801923B2 (en) 2009-12-18 2014-08-12 Hitachi, Ltd. Wastewater treatment apparatus

Families Citing this family (11)

* Cited by examiner, † Cited by third party
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JP4139547B2 (ja) 1999-11-02 2008-08-27 株式会社日立製作所 膜磁気分離装置
JP4317668B2 (ja) * 2001-03-19 2009-08-19 株式会社日立製作所 膜磁気分離装置
WO2005105680A1 (fr) * 2004-04-28 2005-11-10 Ebara Corporation Procédé et appareil pour le traitement de drainage organique et de boue
JP2010172793A (ja) * 2009-01-27 2010-08-12 Shokuniku Seisan Gijutsu Kenkyu Kumiai 亜臨界水処理装置、亜臨界水処理方法、及び該方法で得られる畜水産飼料又は工業原料
JP5218851B2 (ja) * 2009-03-30 2013-06-26 株式会社日立プラントテクノロジー 凝集フロック乾燥方法及び凝集フロック乾燥装置
JP5361749B2 (ja) * 2010-01-12 2013-12-04 株式会社日立製作所 廃水処理装置
JP5422516B2 (ja) 2010-08-23 2014-02-19 株式会社日立製作所 凝集磁気分離装置
JP5694559B2 (ja) * 2010-12-13 2015-04-01 エクソンモービル リサーチ アンド エンジニアリング カンパニーExxon Research And Engineering Company バイオマスの水熱処理からのリンの回収
CN105585232B (zh) * 2015-12-21 2018-02-16 广西壮族自治区环境保护科学研究院 一种含磁污泥的分散脱磁方法
CN112439542B (zh) * 2019-09-03 2023-03-03 国家能源投资集团有限责任公司 一种高温液固磁分离的方法
CN114180689B (zh) * 2021-11-24 2023-06-23 南京信息工程大学 一种原位磁种分离回用的磁混凝水处理方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3803033A (en) * 1971-12-13 1974-04-09 Awt Systems Inc Process for removal of organic contaminants from a fluid stream
US4193866A (en) * 1976-09-27 1980-03-18 General Electric Company Ferrite flocculating system
SE413499B (sv) * 1977-10-24 1980-06-02 Boliden Ab Forfarande och medel for kemisk rening av vatten med atfoljande magnetisk slamavskiljning
US5360553A (en) * 1992-09-17 1994-11-01 Baskis Paul T Process for reforming materials into useful products and apparatus
DE19637711C2 (de) * 1995-09-19 2003-05-28 Hitachi Ltd Magnetabscheidervorrichtung sowie Vorrichtung zur Reinigung von Flüssigkeiten
US5888389A (en) * 1997-04-24 1999-03-30 Hydroprocessing, L.L.C. Apparatus for oxidizing undigested wastewater sludges

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8801923B2 (en) 2009-12-18 2014-08-12 Hitachi, Ltd. Wastewater treatment apparatus
CN101811090B (zh) * 2010-05-11 2011-11-09 贵州铝城铝业原材料研究发展有限公司 电解铝废料磁选方法

Also Published As

Publication number Publication date
JP3456135B2 (ja) 2003-10-14
EP0931593A2 (fr) 1999-07-28
JPH11207399A (ja) 1999-08-03
EP0931593A3 (fr) 1999-12-01
DE69909854T2 (de) 2004-06-03
DE69909854D1 (de) 2003-09-04

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